I have the same hardware:
$ lspci -vnn | grep -A1 Audio
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller [8086:284b] (rev 03)
Subsystem: Hewlett-Packard Company Device [103c:30d9]
$ cat /proc/asound/card*/codec\#*|grep -i codec
Codec: Conexant CX20549 (Venice)
I added c4pp4's PPA and now I have no volume controls for the internal
or external mic. Before, I had volume sliders. Sound works fine both
before and after upgrading the kernel. The microphone just doesn't work
either way.
--
[regression]snd-hda-intel sound input does not work at all with Conexant
CX20549 (Venice) chips
https://bugs.launchpad.net/bugs/278648
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